Closes: https://github.com/zed-industries/zed/issues/25683

Remove two bad examples from the key binding docs.
`cmd-shift-p` (command palette) and `cmd-p` (file finder) are async
operations and thus do not work properly with
`workspace::SendKeystrokes`.

Originally reported in
https://github.com/zed-industries/zed/issues/25683#issuecomment-3145830534

Release Notes:

- N/A